66708174689 has 8 divisors (see below), whose sum is σ = 71923411560. Its totient is φ = 61504914816.

The previous prime is 66708174649. The next prime is 66708174703. The reversal of 66708174689 is 98647180766.

It can be written as a sum of positive squares in 4 ways, for example, as 34705827025 + 32002347664 = 186295^2 + 178892^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66708174689 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66708174649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2982674 + ... + 3004955.

It is an arithmetic number, because the mean of its divisors is an integer number (8990426445).

Almost surely, 2^66708174689 is an apocalyptic number.

It is an amenable number.

66708174689 is a deficient number, since it is larger than the sum of its proper divisors (5215236871).

66708174689 is a wasteful number, since it uses less digits than its factorization.

66708174689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5988499.

The product of its (nonzero) digits is 24385536, while the sum is 62.

The spelling of 66708174689 in words is "sixty-six billion, seven hundred eight million, one hundred seventy-four thousand, six hundred eighty-nine".